JPH0985784A - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH0985784A JPH0985784A JP24307595A JP24307595A JPH0985784A JP H0985784 A JPH0985784 A JP H0985784A JP 24307595 A JP24307595 A JP 24307595A JP 24307595 A JP24307595 A JP 24307595A JP H0985784 A JPH0985784 A JP H0985784A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- molded product
- mold
- mold plate
- protruding piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0043—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks preventing shrinkage by reducing the wall thickness of the moulded article
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リブやボス等の突
出片を有する成形品の射出成形金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die for a molded product having a protruding piece such as a rib or a boss.
【０００２】[0002]
【従来の技術】従来、平滑な表面を有する成形品におい
て、この裏側にリブを立設して成形品本体を補強した
り、或いは組立等のためにボスを立設したりして、成形
品本体よりこのような突出片を突き出して設ける場合、
成形品本体のこの突出片の周囲が特に他の部分より厚肉
となるために、成形品の表面側に凹陥部分、所謂ひけが
発生する。2. Description of the Related Art Conventionally, in a molded product having a smooth surface, a rib is erected on the back side to reinforce the body of the molded product or a boss is erected for assembly etc. When such a protruding piece is provided by protruding from the main body,
Since the periphery of the protruding piece of the molded product body is thicker than the other parts, a concave portion, that is, a sink mark is generated on the surface side of the molded product.
【０００３】上記のようなひけが発生するプロセスは、
以下のように説明される。即ち、このひけの現象は、キ
ャビティ内に射出された溶融樹脂が金型の冷却により冷
却、固化されていく際の収縮特性に起因するものであ
り、一般的に均一な肉厚の成形品において、肉厚の変動
がある箇所に発生する。The process in which the sink marks described above occur is
It is described as follows. That is, the sink mark phenomenon is caused by the shrinkage characteristics when the molten resin injected into the cavity is cooled and solidified by cooling the mold, and generally in a molded product having a uniform thickness. , It occurs in places where the wall thickness varies.
【０００４】例えば、図５に示すように、内側にリブが
設けられた成形品の場合を例にとって説明すると、成形
品本体１００の内側にリブ２００が設けられることによ
り、リブ２００と成形品本体１００とのつながり間に厚
肉部１０２が形成されることになるが、この厚肉部１０
２が所謂熱溜まりとなる。For example, as shown in FIG. 5, the case of a molded product having ribs on the inside will be described as an example. By providing the ribs 200 on the inside of the molded product main body 100, the ribs 200 and the molded product main body are provided. A thick portion 102 is formed between the thick portion 102 and the portion 100.
2 is a so-called heat pool.
【０００５】射出成形工程において、キャビティへの溶
融樹脂の充填が完了して、金型の冷却が開始されると、
キャビティ内の高温の溶融樹脂は、キャビティを形成し
ている固定側型板や可動側型板の表面側より冷却されて
ゆく。In the injection molding process, when the cavity is completely filled with the molten resin and cooling of the mold is started,
The high temperature molten resin in the cavity is cooled from the surface side of the fixed-side mold plate and the movable-side mold plate forming the cavity.
【０００６】この場合、均一な肉厚さの箇所は内部に向
かって均等に冷却され、良好な平滑表面となって成形さ
れるが、図示のように、リブ２００が設けられて厚肉部
１０２が形成されていると、この厚肉部１０２の冷却が
他の部分より遅れてゆくことになり、先に冷却が進んだ
成形品本体１００の表面側が内側に引き込まれるため、
凹陥部３００、所謂ひけが発生した状態となる。In this case, a portion having a uniform wall thickness is uniformly cooled toward the inside to form a good smooth surface, but as shown in the drawing, a rib 200 is provided to form a thick wall portion 102. Is formed, the cooling of the thick portion 102 is delayed compared to other portions, and the front surface side of the molded product body 100, which has been cooled earlier, is drawn inward.
The concave portion 300, a so-called sink mark, is generated.
【０００７】上記のこのようなひけの発生を解消するた
め、従来、キャビティへの溶融樹脂の射出のため設けら
れるゲート、ランナー等の設計の変更を行ったり、成形
品本体の肉厚を厚くするといった方法がとられてきた
（「射出成形技術の基本と応用」 日本プラスチック加
工技術協会刊行 ５−７（気泡、ひけ）参照）。In order to eliminate the above-described occurrence of sink marks, conventionally, the design of the gate, runner, etc. provided for injecting the molten resin into the cavity is changed, or the wall thickness of the molded product body is increased. Has been adopted (see “Basics and Applications of Injection Molding Technology” published by Japan Plastic Processing Technology Association 5-7 (air bubbles, sink marks)).
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記の
ようなひけの対処方法において、前者のゲート、ランナ
ー等の設計の変更のみでは、成形品本体の形状や肉厚、
又、リブやボスの大きさ、形状等によっては解消し切れ
ないといった問題が残されている。又、後者の成形品本
体の肉厚さを厚くするといった対処方法は、本意なもの
ではなく、過剰品質を招き、製品重量の増大ばかりか、
コストアップとなるなどの問題がある。However, in the above-described method for dealing with sink marks, the shape and wall thickness of the molded product body,
Further, there remains a problem that the ribs and bosses cannot be completely eliminated depending on the size and shape of the ribs and bosses. Also, the latter method of increasing the thickness of the molded product body is not intentional, and it causes excessive quality and increases the product weight.
There are problems such as increased costs.
【０００９】本発明は、上記のこのような問題点に着眼
してなされたものであり、その目的とするところは、こ
れらの問題点を解消し、金型の設計変更や、成形品の肉
厚を増加させることなく、リブやボス等の突出片が設け
られた成形品において、その表面にひけが発生しない品
質が優れた成形が可能な射出成形金型を提供するもので
ある。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to solve these problems, to change the design of the mold, and the meat of the molded product. Provided is an injection molding die capable of molding a molded product provided with a protruding piece such as a rib or a boss without increasing the thickness thereof, which is free from sink marks on the surface thereof and is excellent in quality.
【００１０】[0010]
【課題を解決するための手段】本発明の射出成形金型に
おいては、可動側型板と固定側型板とにより形成された
キャビティに溶融樹脂を射出してリブやボス等の突出片
を有する成形品を成形する射出成形金型において、上記
いずれかの型板内にキャビティに連通する突出片形成部
が延設され、この突出片形成部のキャビティ側周囲に、
型板よりキャビティ内に突き出して突出部が設けられ、
成形品の突出片の立上り部の周囲に薄肉部が形成される
ようになされていることを特徴とする。In the injection mold of the present invention, a molten resin is injected into a cavity formed by a movable side mold plate and a fixed side mold plate to have a protruding piece such as a rib or a boss. In an injection molding die for molding a molded product, a protruding piece forming portion communicating with the cavity is extended in any one of the mold plates, and around the cavity side of the protruding piece forming portion,
A protrusion is provided by protruding from the template into the cavity,
A thin portion is formed around the rising portion of the protruding piece of the molded product.
【００１１】[0011]
【作用】本発明の射出成形金型においては、型板内にキ
ャビティに連通する突出片形成部が延設され、この突出
片形成部のキャビティ側周囲に、型板よりキャビティ内
に突き出して突出部が設けられているので、成形品の突
出片の立上り部の周囲に薄肉部が形成され、従来のよう
な熱溜まりが生成されず、表面にひけの発生がない優れ
た品質の成形品の成形が可能である。In the injection-molding die of the present invention, the projecting piece forming portion communicating with the cavity is extended in the mold plate, and the projecting piece forming portion projects around the cavity side and projects from the mold plate into the cavity. Since a part is provided, a thin part is formed around the rising part of the protruding piece of the molded product, heat accumulation unlike in the past is not generated, and there is no sink mark on the surface of the molded product of excellent quality. It can be molded.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施例を図面を参
照して説明する。図１は、本発明の射出成形金型の一例
を示す要部の断面図である。図１において、射出成形金
型１０には、可動側型板１１と固定側型板１２とにより
キャビティ１３が形成され、このキャビティ１３に溶融
樹脂が射出されて成形品が成形されるようになってい
る。又、キャビティ１３の固定側型板１２側が成形品の
表面を、可動側型板１１側が成形品の内側を形成するよ
うになっている。このキャビティ１３には、キャビティ
１３に連通するゲート（図示しない）より溶融樹脂が射
出されるようになっている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part showing an example of an injection mold of the present invention. In FIG. 1, a cavity 13 is formed by a movable side mold plate 11 and a fixed side mold plate 12 in an injection mold 10, and a molten resin is injected into this cavity 13 to mold a molded product. ing. The fixed mold plate 12 side of the cavity 13 forms the surface of the molded product, and the movable mold plate 11 side forms the inside of the molded product. Molten resin is injected into the cavity 13 from a gate (not shown) communicating with the cavity 13.
【００１３】上記可動側型板１１にはキャビティ１３よ
り連通して、突出片である補強用のリブを成形するため
のに突出片形成部１４が設けられている。この突出片形
成部１４のキャビティ１３側先端周囲には、可動側型板
１１よりキャビティ１３内に突き出して断面形状が角形
の突出部１５が設けられている。従って、成形品のリブ
の周囲を形成する突出部１５には、溶融樹脂が充填され
ることなく、成形品には薄肉部が形成される。The movable mold plate 11 is provided with a protruding piece forming portion 14 which communicates with the cavity 13 and is used to form a reinforcing rib which is a protruding piece. Around the tip of the protruding piece forming portion 14 on the cavity 13 side, there is provided a protruding portion 15 protruding from the movable side mold plate 11 into the cavity 13 and having a square cross-section. Therefore, the protruding portion 15 forming the periphery of the rib of the molded product is not filled with the molten resin, and a thin portion is formed in the molded product.
【００１４】この薄肉部が形成されることにより、突出
片形成部１４の立上がり部より成形品の肉厚側の内部に
は従来のような熱溜まりができず、冷却遅延部が発生す
ることなく、ほぼ均等な冷却・固化が可能となり、表面
にひけがない品質が優れた成形品を得ることが可能であ
る。By forming this thin wall portion, heat accumulation as in the conventional case cannot be formed inside the thick portion of the molded product from the rising portion of the protruding piece forming portion 14, and a cooling delay portion does not occur. As a result, it is possible to cool and solidify almost uniformly, and it is possible to obtain a molded product with excellent surface quality and no sink marks.
【００１５】図２は、本発明の射出成形金型の他の例を
示す要部の断面図である。図２において、射出成形金型
２０には、可動側型板２１と固定側型板２２とによりキ
ャビティ２３が形成され、このキャビティ２３に溶融樹
脂が射出されて成形品が成形されるようになっている。
又、キャビティ２３の固定側型板２２側が成形品の表面
を、可動側型板２１側が成形品の内側を形成するように
なっている。このキャビティ２３には、キャビティ２３
に連通するゲート（図示しない）より溶融樹脂が射出さ
れるようになっている。FIG. 2 is a sectional view of a main part showing another example of the injection molding die of the present invention. In FIG. 2, a cavity 23 is formed in the injection molding die 20 by the movable side mold plate 21 and the fixed side mold plate 22, and molten resin is injected into the cavity 23 to mold a molded product. ing.
The fixed mold plate 22 side of the cavity 23 forms the surface of the molded product, and the movable mold plate 21 side forms the inside of the molded product. This cavity 23 has a cavity 23
The molten resin is injected from a gate (not shown) communicating with the.
【００１６】上記可動側型板２１にはキャビティ２３よ
り連通して、突出片である中心部に中空部を有するボス
を成形するためのに突出片形成部２４が設けられてい
る。この突出片形成部２４のキャビティ２３側先端周囲
には、可動側型板２１よりキャビティ２３内に突き出し
て断面形状が角形の突出部２５が設けられている。従っ
て、成形品のボスの周囲を形成する突出部２５には、溶
融樹脂が充填されることなく、成形品には薄肉部が形成
される。The movable mold plate 21 is provided with a protruding piece forming portion 24 communicating with the cavity 23 for forming a boss having a hollow portion at the center which is a protruding piece. Around the tip of the protruding piece forming portion 24 on the cavity 23 side, there is provided a protruding portion 25 protruding from the movable side mold plate 21 into the cavity 23 and having a square cross-section. Therefore, the protruding portion 25 forming the periphery of the boss of the molded product is not filled with the molten resin, and a thin portion is formed in the molded product.
【００１７】この薄肉部が形成されることにより、突出
片形成部２４の立上がり部より成形品の肉厚側の内部に
は従来のような熱溜まりができず、冷却遅延部が発生す
ることなく、ほぼ均等な冷却・固化が可能となり、表面
にひけがない品質が優れた成形品を得ることが可能であ
る。By forming this thin portion, heat accumulation as in the conventional case cannot be formed inside the thicker portion of the molded product than the rising portion of the protruding piece forming portion 24, and a cooling delay portion does not occur. As a result, it is possible to cool and solidify almost uniformly, and it is possible to obtain a molded product with excellent surface quality and no sink marks.
【００１８】上記の２実施例において、成形品本体の肉
厚をＡ、突出部１５、２５の周方向における幅をＢ、突
出高さをＣ（即ち、成形品としての薄肉部の幅、深さ）
とすると、 Ｂ、Ｃ＝Ａ／５〜Ａ／２ とするのが好適であり、使用される熱可塑性樹脂の特
性、成形条件により、その値が適宜に設定される。In the above-mentioned two embodiments, the thickness of the molded product body is A, the circumferential width of the protruding portions 15 and 25 is B, and the protruding height is C (that is, the width and depth of the thin portion as a molded product). That)
Then, it is preferable that B and C = A / 5 to A / 2, and the values are appropriately set depending on the characteristics of the thermoplastic resin used and the molding conditions.
【００１９】図３は、本発明の射出成形金型の更に他の
例を示す要部の断面図である。図３において、射出成形
金型３０には、可動側型板３１と固定側型板３２とによ
りキャビティ３３が形成され、このキャビティ３３に溶
融樹脂が射出されて成形品が成形されるようになってい
る。又、キャビティ３３の固定側型板３２側が成形品の
表面を、可動側型板３１側が成形品の内側を形成するよ
うになっている。このキャビティ３３には、キャビティ
３３に連通するゲート（図示しない）より溶融樹脂が射
出されるようになっている。FIG. 3 is a sectional view of a main part showing still another example of the injection molding die of the present invention. In FIG. 3, a cavity 33 is formed in the injection molding die 30 by the movable side mold plate 31 and the fixed side mold plate 32, and molten resin is injected into the cavity 33 to mold a molded product. ing. The fixed mold plate 32 side of the cavity 33 forms the surface of the molded product, and the movable mold plate 31 side forms the inside of the molded product. Molten resin is injected into the cavity 33 from a gate (not shown) communicating with the cavity 33.
【００２０】上記可動側型板３１にはキャビティ３３よ
り連通して、突出片である補強用のリブを成形するため
のに突出片形成部３４が設けられている。この突出片形
成部３４のキャビティ３３側先端周囲には、可動側型板
３１の周囲より突出片形成部３４の先端に向かって徐々
に傾斜上昇する突出部３５が設けられている。従って、
成形品のリブの周囲を形成する突出部３５には、溶融樹
脂が充填されることなく、成形品には薄肉部が形成され
る。The movable mold plate 31 is provided with a protruding piece forming portion 34 which communicates with the cavity 33 and is used to form a reinforcing rib which is a protruding piece. Around the tip of the protruding piece forming portion 34 on the cavity 33 side, there is provided a protruding portion 35 that gradually rises from the periphery of the movable side mold plate 31 toward the tip of the protruding piece forming portion 34. Therefore,
The protruding portion 35 forming the periphery of the rib of the molded product is not filled with the molten resin, and a thin portion is formed in the molded product.
【００２１】この薄肉部が形成されることにより、突出
片形成部３４の立上がり部より成形品の肉厚側の内部に
は従来のような熱溜まりができず、冷却遅延部が発生す
ることなく、ほぼ均等な冷却・固化が可能となり、表面
にひけがない品質が優れた成形品を得ることが可能であ
る。Due to the formation of the thin wall portion, heat accumulation as in the conventional case cannot be formed inside the thicker portion of the molded product than the rising portion of the protruding piece forming portion 34, and a cooling delay portion does not occur. As a result, it is possible to cool and solidify almost uniformly, and it is possible to obtain a molded product with excellent surface quality and no sink marks.
【００２２】図４は、本発明の射出成形金型の更に他の
例を示す要部の断面図である。図４において、射出成形
金型４０には、可動側型板４１と固定側型板４２とによ
りキャビティ４３が形成され、このキャビティ４３に溶
融樹脂が射出されて成形品が成形されるようになってい
る。又、キャビティ４３の固定側型板４２側が成形品の
表面を、可動側型板４１側が成形品の内側を形成するよ
うになっている。このキャビティ４３には、キャビティ
４３に連通するゲート（図示しない）より溶融樹脂が射
出されるようになっている。FIG. 4 is a sectional view of a main part showing still another example of the injection molding die of the present invention. In FIG. 4, a cavity 43 is formed by a movable side mold plate 41 and a fixed side mold plate 42 in an injection molding die 40, and a molten resin is injected into this cavity 43 to mold a molded product. ing. The fixed mold plate 42 side of the cavity 43 forms the surface of the molded product, and the movable mold plate 41 side forms the inside of the molded product. Molten resin is injected into the cavity 43 from a gate (not shown) communicating with the cavity 43.
【００２３】上記可動側型板４１にはキャビティ４３よ
り連通して、中心部に中空部を有する突出片であるボス
を成形するためのに突出片形成部４４が設けられてい
る。この突出片形成部４４のキャビティ４３側先端周囲
には、可動側型板４１の周囲より突出片形成部４４の先
端に向かって徐々に傾斜上昇する突出部４５が設けられ
ている。従って、成形品のボスの周囲を形成する突出部
４５には、溶融樹脂が充填されることなく、成形品には
薄肉部が形成される。The movable mold plate 41 is provided with a protruding piece forming portion 44 which communicates with the cavity 43 and is used to form a boss which is a protruding piece having a hollow portion at the center. Around the tip of the protruding piece forming portion 44 on the side of the cavity 43, there is provided a protruding portion 45 that gradually rises from the periphery of the movable side mold plate 41 toward the tip of the protruding piece forming portion 44. Therefore, the protruding portion 45 forming the periphery of the boss of the molded product is not filled with the molten resin, and a thin wall portion is formed in the molded product.
【００２４】この薄肉部が形成されることにより、突出
片形成部４４の立上がり部より成形品の肉厚側の内部に
は従来のような熱溜まりができず、冷却遅延部が発生す
ることなく、ほぼ均等な冷却・固化が可能となり、表面
にひけがない品質が優れた成形品を得ることが可能であ
る。By forming this thin portion, heat accumulation as in the conventional case cannot be formed inside the thick portion of the molded product from the rising portion of the protruding piece forming portion 44, and a cooling delay portion does not occur. As a result, it is possible to cool and solidify almost uniformly, and it is possible to obtain a molded product with excellent surface quality and no sink marks.
【００２５】上記の２実施例において、成形品本体の肉
厚をＤ、突出部３５、４５の周方向における幅をＥ、突
出高さをＦ（即ち、成形品としての薄肉部の幅、深さ）
とすると、 Ｅ＝２Ｄ〜５Ｄ Ｆ＝Ｄ／５〜Ｄ／２ とするのが好適であり、使用される熱可塑性樹脂の特
性、成形条件等により、その値が適宜に設定される。In the above-mentioned two embodiments, the thickness of the molded product body is D, the circumferential width of the projections 35 and 45 is E, and the projection height is F (that is, the width and depth of the thin part as a molded product). That)
Then, it is preferable that E = 2D to 5D F = D / 5 to D / 2, and the value is appropriately set depending on the characteristics of the thermoplastic resin used, molding conditions, and the like.
【００２６】[0026]
【発明の効果】本発明の射出成形金型においては、型板
内にキャビティに連通する突出片形成部が延設され、こ
の突出片形成部のキャビティ側周囲に、型板よりキャビ
ティ内に突き出して突出部が設けられているので、成形
品の突出片の立上り部の周囲に薄肉部が形成され、従来
のような熱溜まりが生成されず、表面にひけの発生がな
い優れた品質の成形品の成形が可能である。従って、リ
ブやボスを有する成形品の射出成形金型として好適であ
る。In the injection molding die of the present invention, the protruding piece forming portion communicating with the cavity is extended in the mold plate, and the protruding piece forming portion is protruded into the cavity from the mold plate around the cavity side. Since a protruding part is provided on the molded part, a thin part is formed around the rising part of the protruding piece of the molded product, heat accumulation unlike in the past is not generated, and sinking does not occur on the surface. It is possible to mold products. Therefore, it is suitable as an injection mold for a molded product having ribs and bosses.
【図１】本発明の射出成形金型の一例を示す要部の断面
図。FIG. 1 is a sectional view of a main part showing an example of an injection molding die of the present invention.
【図２】本発明の射出成形金型の他の例を示す要部の断
面図。FIG. 2 is a sectional view of a main part showing another example of the injection molding die of the present invention.
【図３】本発明の射出成形金型の更に他の例を示す要部
の断面図。FIG. 3 is a sectional view of an essential part showing still another example of the injection molding die of the present invention.
【図４】本発明の射出成形金型の更に他の例を示す要部
の断面図。FIG. 4 is a sectional view of a main part showing still another example of the injection molding die of the present invention.
【図５】従来の射出成形金型を示す要部の断面図。FIG. 5 is a cross-sectional view of a main part showing a conventional injection molding die.
１０ 射出成形金型 １１、２１、３１、４１ 可動側型板 １２、２２、３２、４２ 可動側型板 １３、２３、３３、４３ キャビティ １４、２４、３４、４４ 突出片形成部 １５、２５、３５、４５ 突出部 Ａ、Ｄ 肉厚 Ｂ、Ｅ 幅 Ｃ、Ｆ 高さ 10 Injection Molds 11, 21, 31, 41 Movable Side Mold Plates 12, 22, 32, 42 Movable Side Mold Plates 13, 23, 33, 43 Cavities 14, 24, 34, 44 Projecting Piece Forming Parts 15, 25, 35, 45 Projection A, D Wall thickness B, E Width C, F Height
Claims (1)
れたキャビティに溶融樹脂を射出してリブやボス等の突
出片を有する成形品を成形する射出成形金型において、
上記いずれかの型板内にキャビティに連通する突出片形
成部が延設され、この突出片形成部のキャビティ側周囲
に、型板よりキャビティ内に突き出して突出部が設けら
れ、成形品の突出片の立上り部の周囲に薄肉部が形成さ
れるようになされていることを特徴とする射出成形金
型。1. An injection molding die for molding a molded product having a protruding piece such as a rib or a boss by injecting a molten resin into a cavity formed by a movable side mold plate and a fixed side mold plate,
A protruding piece forming portion that communicates with the cavity is extended in one of the mold plates, and a protruding portion that protrudes into the cavity from the mold plate is provided around the cavity side of the protruding piece forming portion, and the protruding product is formed. An injection mold, wherein a thin portion is formed around the rising portion of the piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24307595A JPH0985784A (en) | 1995-09-21 | 1995-09-21 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24307595A JPH0985784A (en) | 1995-09-21 | 1995-09-21 | Injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0985784A true JPH0985784A (en) | 1997-03-31 |
Family
ID=17098419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24307595A Pending JPH0985784A (en) | 1995-09-21 | 1995-09-21 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0985784A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2448084A3 (en) * | 2010-10-26 | 2013-07-17 | Makita Corporation | Battery charger |
| JP2018153957A (en) * | 2017-03-16 | 2018-10-04 | 京セラインダストリアルツールズ株式会社 | Resin injection molded product |
-
1995
- 1995-09-21 JP JP24307595A patent/JPH0985784A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2448084A3 (en) * | 2010-10-26 | 2013-07-17 | Makita Corporation | Battery charger |
| US8786254B2 (en) | 2010-10-26 | 2014-07-22 | Makita Corporation | Battery charger |
| JP2018153957A (en) * | 2017-03-16 | 2018-10-04 | 京セラインダストリアルツールズ株式会社 | Resin injection molded product |
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